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The First Report on Periphytic Diatoms on Artificial and Natural Substrate In Acta Bot. Croat. 74 (2), 393–406, 2015 CODEN: ABCRA 25 ISSN 0365-0588 eISSN 1847-8476 DOI: 10.1515/botcro-2015-0029 The fi rst report on periphytic diatoms on artifi cial and natural substrate in the karstic spring Bunica, Bosnia and Herzegovina 1 2 2 ANITA DEDIĆ *, ANĐELKA PLENKOVIĆ-MORAJ , KORALJKA KRALJ BOROJEVIĆ , DUBRAVKA HAFNER1 1 Department of Biology, Faculty of Science and Education, University of Mostar, Matice hrvatske bb, 88 000 Mostar, Bosnia and Herzegovina 2 Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10 000 Zagreb, Croatia Abstract – This study presents investigations of the periphytic diatoms on artifi cial (glass slides) and natural substrates in the karstic, limnocrene spring of Bunica situated in the south of Bosnia and Herzegovina. Investigations were performed in summer 2010. Sam- ples were collected every seven days for eight weeks. Physical and chemical characteris- tics of water, temperature, oxygen saturation, dissolved oxygen, electric conductivity and nutrients as well as fl ow velocity at sample site, were measured simultaneously with each sampling. Physical and chemical characteristics showed low temperature oscillations, good aeration and oligotrophic conditions. In general, greater diatom diversity was noted on natural substrate. A total of 104 diatom species were found on natural substrate and 82 on glass slides. The best represented genera on both types of substrate were Gomphonema and Navicula (each with eight species), Nitzschia (with six species), and Cocconeis (with fi ve species). Achnanthidium exiguum, Achnanthidium minutissimum, Amphora pedicu- lus, Cymbopleura amphicephala and Surirella minuta were recorded in all samples of natural substrate and Gomphonema minutum in artifi cial substrate samples. Key words: Bosnia and Herzegovina, Bunica Spring, glass slides, karst spring, periphytic diatoms Introduction Karst is a very specifi c geomorphological phenomenon, characterized by a rapid perco- lation of surface water into the underground as well as by the paucity of surface water fl ows. Most fl ows occur below the surface. Karst springs are a common occurrence in karst, as a special type of landscape, and they are places where groundwater comes to the surface * Corresponding author, e-mail: [email protected] ACTA BOT. CROAT. 74 (2), 2015 393 DEDIĆ A., PLENKOVIĆ-MORAJ A., KRALJ BOROJEVIĆ K., HAFNER D. creating a visible fl ow. Limnocrene springs are the most widespread type of springs in cal- careous substrates, such as karst (DI SABATINO et al. 1997). According to their hydrological, physical and chemical characteristics, karstic springs are attractive and interesting ecologi- cal sites. They are characterized by physico-chemical stability. Almost all springs have a low water temperatures (8–12 °C) with small annual fl uctuations, high concentrations of oxygen (8–12 mg L–1) and high concentrations of carbon dioxide (up to 60 mg L–1) (BLAGOJEVIĆ 1974, CANTONATI et al. 2007). Karst springs have high alkalinity, which is mainly due to carbonates, and high carbonate hardness (BLAGOJEVIĆ 1974, ŠTAMBUK- GILJANOVIĆ 1998). The concentration of nitrite is about 0.01 mg L–1 (CANTONATI et al. 2007) and concentrations of nitrate 0.4–8.0 mg L–1. Sulphates are usually present with concentra- tions of a few tenths of mg L–1 while hundreds of mg L–1 can be found in springs fed by aquifers that also include evaporites or geological formations which contain gypsum (CAN- TONATI et al. 2007). Phosphorus is also present in low concentrations (0.005–0.050 mg L–1) (BLAGOJEVIĆ 1974, WERUM 2001). Silicates are very important for the growth of diatoms. Underground waters in siliceous aquifers usually hold 3–10 mg L–1 and in carbonate aqui- –1 fers about 1 mg L SiO2 (CANTONATI et al. 2007). A common characteristic of karstic springs, whether permanent or temporary, is the strong dependence of discharge on precipitation. As a consequence, the ratio between mini- mum and maximum discharge is great (1:60, or more). The minimum and maximum dis- charges registered for Bunica Spring were 0.72 and 207 m3 s–1, respectively (MILANOVIĆ 2006). All values of physico-chemical parameters during major rainfall may be increased. The periphytic communities of karstic springs in Bosnia and Herzegovina have not been suffi ciently studied; only few authors have addressed the issue (BLAGOJEVIĆ 1974, 1976, 1979, HAFNER 2009, HAFNER et al. 2010, DEDIĆ et al. 2012). Algae, especially dia- toms, in springs have received little attention in Bosnia and Herzegovina, despite the fact that springs provide specifi c conditions that cannot be found in any other freshwater eco- system and notwithstanding their great importance in terms of general environmental changes. The aim of this study was to determine the qualitative and quantitative composition of periphytic diatoms on artifi cial (glass slides) and natural substrates in fast and slow water fl ow in the Bunica Spring. The results of this study give us preliminary results from the investigations of periphytic diatoms in springs and are a fi rst step towards a detailed elaboration of diatom distribution and taxonomy in this very poorly investigated area. Materials and methods Study area Bunica Spring is a deep siphonal limnocrene spring of the eponymous river Bunica. It is located in the southeastern part of the Mostar valley, near the towns of Blagaj and Mostar (Fig. 1) in the south of Bosnia and Herzegovina. The Bunica River is 6 km long and is the main left tributary of the river Buna, a tributary of the river Neretva. There are no direct hydrogeological connections between the Buna and the Bunica (MILANOVIĆ 2006). The out- let channel was researched to the depth of 73 m and over a length of 160 m (MILANOVIĆ 2006). Bunica Spring is the surface outlet of the underground part of the Zalomka River, 394 ACTA BOT. CROAT. 74 (2), 2015 PERIPHYTIC DIATOMS IN KARSTIC SPRING BUNICA Fig. 1. Study area site of Bunica Spring located in the southeastern part of the Mostar valley, near the towns of Blagaj and Mostar in the south of Bosnia and Herzegovina. subsequent to its sinking into the Biograd Ponor (Fig. 1). The catchment area of Bunica Spring is estimated at approximately 160 km2 (not including the Zalomka River) (MILANOVIĆ 2006). Biograd Ponor and Bunica Spring are directly connected with the karst channel which is one of the most direct underground connections in this part of Dinaric karst (MILANOVIĆ 2006). Bunica Spring is located at the contact between karstifi ed carbonate rocks and Miocene deposits. It is located in an area infl uenced by the Mediterranean climate, which is charac- terized by long, hot summers and rainy winters with rare occurences of snow (GALIĆ 2011). The average annual air temperature is 14.6 °C. The highest daily average temperature is 23.2 °C in July and the lowest below 5.8 °C in January (data for the city of Mostar, for the period 1971–2000, recorded by Meteorological and Hydrological Service of Bosnia and Herzegovina). The total annual precipitation is about 1,515 mm. This area has approxi- mately 2,291 hours of sunshine per year. Average relative humidity is 69. Water vegetation in Bunica Spring consists of algae and mosses, leaves, branches and roots of plants. Sampling Samples from artifi cial and natural substrate and water for physical and chemical analy- ses were collected in summer 2010 in Bunica Spring. Summer minimum riverine water discharge and higher temperature conditions provide favorable and stable conditions for the development of periphytic diatoms (HILLEBRAND and SOMMER 2000). Diatom colonization was monitored after 7, 14, 21, 28, 35, 42, 49 and 56 days of expo- sure of artifi cial substrates (glass slides) that were horizontally placed and oriented parallel to the current velocity. Two different microhabitats were defi ned with regard to the current velocity. Current velocities of water were measured using a DOSTMANN P 670 probe.The microhabitats were made of seven glass slides that were fi xed on the upper side of a brick. ACTA BOT. CROAT. 74 (2), 2015 395 DEDIĆ A., PLENKOVIĆ-MORAJ A., KRALJ BOROJEVIĆ K., HAFNER D. Glass slides were washed with distilled water before being placed into the spring and one or two slides were taken every seven days. Samples from the artifi cial substrate were stored in a labeled bottle in the fi eld and upon return to the laboratory they were scraped with a razor blade and scalpel. Simultaneously, samples from the natural substrate were collected applying the stan- dard procedure of scraping sludgy material from the rock’s surface making sure that the to- tal surface of all rocks is about 500 cm2 (EUROPEAN STANDARD EN 13946, 2003). Rocks were chosen randomly according to standard procedures. Identifi cation and morphological examination of diatoms All the samples were fi xed with 4% formaldehyde. Permanent preparations of diatoms were prepared using the HUSTEDT (1930) method. The species were identifi ed using the mi- croscopes Olympus BX53 and Carl Zeiss Jena. Different keys and guides were used for taxa determination: HUSTEDT (1930), KRAMMER and LANGE-BERTALOT (1986, 1988a, 1988b), KRAMMER (1988, 2000, 2004, 2010), LANGE-BERTALOT (2001, 2002). The nomenclature of taxa is determined by the nomenclature set out in algae base (GUIRY and GUIRY 2014). Measurement of physico-chemical parameters of spring water The physical and chemical parameters considered in this study were: water temperature, oxygen saturation, dissolved oxygen, electric conductivity and nutrients (nitrate, nitrite, silicate and orthophosphate) as well as fl ow velocity. Water temperature, dissolved oxygen, oxygen saturation and conductivity were measured using the WTW probe (Wissen- schaftlich-TechnischeWersätten GmbH & Co. KG-Weilheim) whereas nutrient concentra- tions (mg L–1) were determined using the standard spectrophotometrical method (APHA, 1995) in Public Utility Company in Ljubuški. To test the differences between the fl ow regimes and different exposure periods, one- way ANOVA with post hoc Bonferoni test was employed.
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